Definition of make sure
- Make sure (that) you turn the oven off.
- They made sure everyone knew where they were supposed to be.
: behave, act
: to begin or seem to begin (an action)
: to cause to happen to or be experienced by someone
: the manner or style in which a thing is constructed
: the physical, mental, or moral constitution of a person
: safe from danger or harm
: firmly established : steadfast
: reliable, trustworthy
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